Query help - Group by range of program set

Question

Need help in developing query with the following set of data.
Program
req_id
parent_id
runtime
A
1
-1
30
A1
2
1
20
A2
3
-1
1
A3
4
3
5
A4
5
-1
7
A5
6
-1
4
A6
7
-1
3
A1
8
1
10
A2
9
-1
1
A3
10
9
2
A4
11
-1
3
A5
12
-1
2
A6
13
-1
2
The results I am looking for is in the following format.
Set
G1
G1_time
G2
G2_time
G3
G3_time
Set1
G1
6
G2
11
G3
3
Set2
G1
3
G2
5
G3
2
Can you please tell if this can be achieved using sql in Oracle 11g?
Thanks very much.

Answer 1

Hi,
Depending on your requirements:
WITH   got_grp AS
    SELECT  program
    ,       LAST_VALUE ( CASE
                             WHEN  program = 'A1'
                             THEN  req_id
                         END
                         IGNORE NULLS
                       ) OVER ( ORDER BY  req_id ) AS grp
    ,       req_id
    ,       runtime
    FROM    a
,   got_c_num    AS
    SELECT  DENSE_RANK () OVER (ORDER BY grp) AS grp_num
    ,       runtime
    ,       CEIL ( ROW_NUMBER () OVER ( PARTITION BY  grp
                                        ORDER BY      req_id
                 / 2
                 )     AS c_num
    FROM    got_grp
    WHERE   program  NOT IN ('A', 'A1')
SELECT     'SET' || grp_num    AS "SET"
,          'G1'                AS g1
,          g1_time
,          'G2'                AS g2
,          g2_time
,          'G3'                AS g3
,          g3_time
FROM       got_c_num
PIVOT     (    SUM (runtime)
          FOR c_num  IN ( 1 AS g1_time
                        , 2 AS g2_time
                        , 3 AS g3_time
ORDER BY  grp_num
Output:
SET        G1    G1_TIME G2    G2_TIME G3    G3_TIME
SET1       G1          6 G2         11 G3          3
SET2       G1          3 G2          5 G3          2